Patent USRE34310E successfully refreshed from Google Patents.
Patent EP1111777A2 successfully refreshed from Google Patents.
EP1111777A2
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EP
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A circuit for interfacing a balanced radio frequency power amplifier with an unbalanced load
Assignee: Nokia Oyj
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Filing: 2000-12-19
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Granted: —
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Expires: 2020-12-19
Abstract
Abstract A circuit interfacing balanced RF Power Amplifier (1) with unbalanced load (15) has first shunt inductor (5) and series capacitor (6) connected to first output (2) and first shunt capacitor (17) and series inductor (7) connected to second output (3) of amplifier, and comprises second shunt inductor (9) connected to second output and feeding current to this output. First shunt capacitor may correspond to sum of capacitors required to resonate with series inductor and second shunt inductor. Second shunt inductor may exceed value to resonate with capacitance of first shunt capacitor less capacitor required to resonate with series inductor, by same amount as first shunt inductor exceeds value to resonate with series capacitor. Circuit may further comprise second shunt capacitor (27) connected to first output, whereby first shunt capacitor exceeds sum of capacitors required to resonate with series inductor and second shunt inductor.
Inventors
- 👤 Jesper Riishoej
- 👤 Peter Dam Lerke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:54
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H03F; H03F1/00; H03F1/56; H03F1/565; H03F3/00; H03F3/189; H03F3/19; H03F3/20; H03F3/24; H03F3/245; H03F2200/00; H03F2200/451
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A circuit to interface a balanced Radio Frequency Power Amplifier having first
and second open-ended outputs acting in phase opposition with an unbalanced
load such as a single-ended antenna, the circuit comprising a first shunt
inductor and a series capacitor connected to said first output and a first shunt
capacitor and a series inductor connected to said second output, the series
capacitor and the series inductor each forming part of a flow path leading to the
load, and the first shunt inductor forming part of a flow path from a power supply
to said first output, the circuit being characterised in comprising a second shunt
inductor connected to said second output and forming part of a flow path from a
power supply to said second output.
Claim 2
Dependent Claim
37 words
A circuit according to claim 1, wherein the first shunt inductor with the series
capacitor, and the first shunt capacitor with the series inductor, respectively,
form resonant circuits at or near the operating frequency of the circuit.
Claim 3
Dependent Claim
49 words
A circuit according to claim 1, wherein the capacitance of the first shunt
capacitor approximately corresponds to the sum of the capacitances of two
capacitors required to form resonant circuits with the series inductor and the
second shunt inductor, respectively, at or near the operating frequency of the
circuit.
Claim 4
Dependent Claim
28 words
A circuit according to claim 3, wherein the first shunt inductor forms a
resonant circuit with the series capacitor, at or near the operating frequency of
the circuit.
Claim 5
Dependent Claim
97 words
A circuit according to claim 1, wherein the inductance of the second shunt
inductor by a certain amount exceeds the value required to form a resonant
circuit, at or near the operating frequency of the circuit, with a capacitor having
the capacitance of the first shunt capacitor less the capacitance of a capacitor
required to form a resonant circuit at the same frequency with the series
inductor, and the inductance of the first shunt inductor by approximately the
same amount exceeds the value required to form a resonant circuit with the
series capacitor at the same frequency.
Claim 6
Dependent Claim
71 words
A circuit according to claim 1, further comprising a second shunt capacitor
connected to the first output, wherein the capacitance of the first shunt
capacitor exceeds the sum of the capacitances of two capacitors required to
form resonant circuits with the series inductor and the second shunt inductor,
respectively, at or near the operating frequency of the circuit, by an amount
approximately corresponding to the capacitance of the second shunt capacitor.
Claim 7
Dependent Claim
28 words
A circuit according to claim 6, wherein the first shunt inductor forms a
resonant circuit with the series capacitor, at or near the operating frequency of
the circuit.
Claim 8
Dependent Claim
23 words
A circuit according to any of the preceding claims, wherein the inductances of
the first and the second shunt inductor are approximately equal.
Claim 9
Dependent Claim
35 words
A lay-out of a circuit according to any preceding claims, wherein the terminals
of the first and the second shunt inductor most remote from the outputs of the
amplifier are connected to the same node.
Claim 10
Dependent Claim
26 words
A lay-out according to claim 9, wherein said node is a power supply node
situated between conductor rails being connected to either output of the amplifier.
Claim 11
Dependent Claim
35 words
A lay-out of a circuit according to any of claims, wherein the terminals of the
first and the second shunt capacitor most remote from the outputs of the
amplifier are connected to the same node.
Claim 12
Dependent Claim
28 words
A lay-out according to claim 11, wherein said node is a ground or virtual
ground node situated between conductor rails being connected to either output
of the amplifier.
Claim 13
Dependent Claim
47 words
A lay-out according to any of claims 9-12, wherein the terminals of said
series capacitor and said series inductor are on their load side connected to the
same output node, and this output node is situated between conductor rails
being connected to either output of the amplifier.
Claim 14
Dependent Claim
23 words
A lay-out according to any one of claims 10, 12 and 13, wherein said output
node is situated halfway between said conductor rails.
Claim 15
Dependent Claim
44 words
A circuit to interface a balanced Radio Frequency Power Amplifier having a
first and a second open-ended output acting in phase opposition with an un-balanced
load such as a single-ended antenna substantially as hereinbefore
described with reference to fig. 1 in the accompanying figures.
Claim 16
Dependent Claim
44 words
A circuit to interface a balanced Radio Frequency Power Amplifier having a
first and a second open-ended output acting in phase opposition with an un-balanced
load such as a single-ended antenna substantially as hereinbefore
described with reference to fig. 4 in the accompanying figures.
Claim 17
Dependent Claim
44 words
A circuit to interface a balanced Radio Frequency Power Amplifier having a
first and a second open-ended output acting in phase opposition with an un-balanced
load such as a single-ended antenna substantially as hereinbefore
described with reference to fig. 8 in the accompanying figures.
Claim 18
Dependent Claim
47 words
A lay-out of a circuit to interface a balanced Radio Frequency Power
Amplifier having a first and a second open-ended output acting in phase
opposition with an un-balanced load such as a single-ended antenna
substantially as hereinbefore described with reference to fig. 6 in the
accompanying figures.
References Cited (Backward Citations)
No citation records indexed.
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